Ogbozige FJ. Development of Intensity-Duration-Frequency (IDF) Models for Manually Operated Rain Gauge Catchment: A Case Study of Port Harcourt Metropolis Using 50 Years Rainfall Data. TJET [Internet]. 2022 Feb. 21 [cited 2026 Apr. 7];40(2). Available from: http://196.44.161.124/index.php/tjet/article/view/4584